Electromagnet



July l1, 1950 D. MoHRLocK ET AL ELECTROMAGNET Filed June 28, 1946 E ...r /H r """""""""""s"" k j @@@gmwvk N Q w 1T TT Q NN lm IHH 5 \n\ h mw m Patented July 11, 1950 UNITED STATE Y. .ELECTROMAGNET Davia Mehnock and neige Johnson,

f Chelsea, Mich.

Application June 28, 1946, Serial No. 679,917

n 1 Claim. l

Our invention relates to tools and more particularly to an electro-magnet.

The object of our invention is to provide an electro-magnet adapted to remove parts of axle shafts lodged in the diiferentialgear housings of automobiles or trucks, without dismantling the differentials.

Another object of our invention is to provide an electro-magnet having a core made from a soft steel tube and equipped with a jacket of nonmagnetic material.

Other objects of our invention may appear in the following specification describing our invention with reference to the accompanying drawing illustrating a preferred embodiment of our invention.

It is however to be understood that our invention is not to be limited or restricted to the exact construction and combination of parts described in the specication and shown in the drawing, but that such changes and modifications can be made which fall within the scope of the claim appended hereto.

In the drawing Figure l is a side view of the electro-magnet according to our invention.

Figure 2 is a sectional view taken on the vertical longitudinal center plane of the electromagnet shown in Figure 1.

`Figure 3 is a sectional view taken on line 3-3 in Figure 2, and

Figure 4 is a sectional view taken on line 4--4 in Figure 2.

Referring now in detail tothe drawing the electro-magnet according to our invention has a core I consisting of a soft steel tube. At a distance above the lower end of the core I0 a hole II is provided in one side of the tube. A second hole I2 extends through the wall of tube II] on the same side as the first hole II at a distance above the first mentioned hole. The two holes are arranged at an angle in the wall of the tube so that rthey incline downwardly in outward direction. Y

An insulated electric wire I3 enters the tube I0 at its top .end and extends through the lower hole II. It is then Wound around the soft steel tubev I0 forming the coil I4 of the electro-magnet. The wire enters the tube I0 again through the upper hole I2 and extends upwardly through the tube, as shown at I5 in Figure 2.

At its lower end thesoft steel tube I0 is provided with an inside thread and a brass'plug I6 has an outside thread adapted to engage the inner thread of the soft steel tube I0, so that the lower end of said tube is closed to prevent oil, grease, dirt, etc. from entering the tube.

A hollow cylindrical jacket I 1 surrounds the soft steel tube I 0 and extends from the upper end thereof to and over the lower hole I I in said tube. This jacket I1 is preferably made from a nonmagnetic material such as brass. Its inner diametery is large enough, so that the jacket surrounds also the coil I4 on the core tube I0. The lower end of the jacket is bent inwardly, as shown at I8, to protect the wire coil I4 from oil, grease, dirt and the like.

At the upper end a hollow ycap I9 of non-magnetic material is arranged between the jacket I1 and the tube II). The upper wall 20 is provided with a centrally located hole 2| having rounded walls permitting the wire I3 and the return wire l5 to extend therethrough. The hollow cap I9 has on its upper end a circumferential flange 22 abutting the upper edge of the cylindrical jacket I'I.

A pin 23 extends through the wall of the jacket I'I and the wall of the hollow cap I9 to secure the latter in place.

`The wire I3 and return wire I5 can be connected by any preferred conventional means to a source of electricity, so that the core tube l is energized by the current flowing through the coil I 4. The connecting means and the source of electricity do not form any part of our invention and are therefore neither shown nor described.

The above description shows clearly, that the electro-magnet according to our invention is of very simple construction, but can be used very eciently to remove broken metal parts from the differential gear housing of a car or truck or any other place, which is not easily accessible, without dismantling or disassembling the differential or the like.

The jacket I 'l .of non-magnetic material protects the apparatus against any damage caused by contact of the sides of the electro-magnet with an axle housing.

Having described our invention we claim as new and desire to secure by Letters Patent:

An electro-magnet for removing metal objects from an enclosed space, such as a vehicle rear axle housing, comprising an elongated tubular core having two longitudinally spaced-apart holes v in one end portion thereof, said holes extending Wire being Wound about said core and passed through the other of said holes into said bore and extending out of said bore at said one end of said core to provide an electro-magnetic coil around said core between said holes, an elongated, tubular jacket of non-magnetic material surrounding said core and said coil from said one end of said core to the end of said coil remote therefrom and providing a protective casing for said electro-magnet, a hollow cap of non-magnetic material surrounding said one end of said 'f core within said jacket to support the corresponding end of said jacket on said core, said cap having a rounded hole therein for the passage of said y wire therethrough, and a plug 0f non-magnetic 15 2,095,976

REFERENCES CITED The following references are of record in the ile' of this patent: y

UNITED STATES PrrrErrrs Number Name Date 1,904,224 Hargrove Apr. 18, 1933 1,908,260 Koch et al May 9, 1933 1,908,829 Earl May i6, 1933 Foreman Oct. 19, 1937 

